Sledge wrote on Fri Jan 14, 2011 at 10:13 pm: Oh right Chuck-ee, and the TCU/MFCU on Fan Jet engines do nothing to compensate for changes in atmospheric density, pressure and fuel/oxygen mixtures in order to achieve efficient combustion at higher altitudes. Incomplete combustion = wasted fuel, just what the Airlines need!
I'm not sure why you would be making references to TCU(s), especially where "Fan Jet Engines" are used in the same sentence? Unless your TLA (three letter acronym) has a meaning which I'm not aware of? Its either
Turbo
Control
Unit; for controlling the waste-gate valve in "Turbo-Charged" engine applications, or,
Throttle
Control
Unit, and that is highly unlikely.
I'm not sure what your other point is either; referencing an
Main
Fuel
Control
Unit MFCU?
Look, practically all modern jet aircraft, are equipped with FADEC(s), HMU(s) and EFCU(s), all for the control of the fuel, in one way or another.
The pilots will also have to adjust throttle settings at cruise altitudes, in an effort to try and maximize fuel burn, over the distance planned to travel...headwinds, or weaker than expected, or predicted tailwinds, along with possible course diversions, due to weather (thunderstorms up to 60 thousand feet) can all influence the efficiency of the fuel burn over the course of the planned trip...engines are sometimes, also running below specifications...this is determined through routine "power checks" during flights.
Economics will always dictate, whether it is more financially feasible to change an engine, before its overhaul time is up, simply because its burning more fuel than another one.
Apart from all of that - there still has not been invented, a piece of equipment, on board an airplane, fitted to the engine, which can actually produce...create additional oxygen...the fuel controls can only reduce, the amount of fuel going into the combustion chambers (lean out the mixture) and this is where fuel economy comes in...there is a trade off for speed however...time is also money!
This is why [OXYGEN], airplanes have
altitude operating limits, known as
"Service Ceilings", albeit for the most part, are pretty close, for the classes of certain aircraft.
The Boeing 747-400 series for instance, is 41,000 feet. The Boeing 737-600 series is at 39,400 feet. The Airbuses A319 / A320 / A321 all have a service ceiling of 39,800 feet. And, the new Airbus 380, has a service ceiling of 43,000...the Boeing 777 is 43,100 feet.
The Concord's service ceiling was 60,000 feet, but it had four "After Burner" fitted jet engines.
Sledge repeats on Fri Jan 14, 2011 at 10:13 pm: As I said before you really are a true waste of Digital Space - go away!!
I already responded to this!!
It is conclusively obvious now, that there are certain ones partaking (usual suspects) on this forum, who, when confronted with differences of opinions (rebuttals), become very rude and aggressive (language).
They appear to be left with no other alternatives, I can only surmise from a lack of respect and education, to resort to using personal attacks, perhaps through their personal frustrations of getting nowhere. This is quite often angled toward religion and or God too.
It also does not seem to matter, or make much difference, whether one provides supporting information, which is at most times, credible evidence, provided from very reliable sources, unlike the Wikipedia sources, often used by some.
But, you know what? its not the first time that I have encountered this, and it surely won’t be the last either. And, as I’ve said previously – it is quite normal and expected…typically looked upon as; The Path Of Least Resistance.
Only you can change this.